class Sum { 
    	int n;
    	float f() { 
	 	float sum=0;
     		for(int i=1;i<=n;i++)
	 		sum=sum+i;
    		return sum;  
 	}
}
class Average extends Sum {
       	int n;  
 	float f() { 
	  	float c;
      		super.n=n;
       		c=super.f();
		return c/n; 
	}
      	float g() {
       		float c;
		c=super.f();
	 	return c/2; 
     	}
}
public class Example5_7 {
	   public static void main(String args[]) {
	      	   Average aver=new Average();
	   	   aver.n=100 ;
		   float resultOne=aver.f();
		   float resultTwo=aver.g();
	       	   System.out.println("resultOne="+resultOne);
      		   System.out.println("resultTwo="+resultTwo);
   	   }
}
